Optimization of Solid-State Fermentation with Lactobacillus brevis and Aspergillus oryzae for Trypsin Inhibitor Degradation in Soybean Meal
2013
GAO You-ling, WANG Cai-sheng, ZHU Qiu-hua , QIAN Guo-ying (1.Key Laboratory for Bio-Resource and Eco-Environment, Ministry of Education/State Key Laboratory of Hydraulics and Mountain River Engineering/College of Life Science, Sichuan University, Chengdu 610064, P.R.China 2.Neijiang Hybrid Rice Research and Development Center, Neijiang 641000, P.R.China 3.Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow 83844, USA 4.School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, P.R.China)
The aim of the present study was to optimize trypsin inhibitor degradation in soybean meal by solid-state fermentation (SSF) with Lactobacillus brevis and Aspergillus oryzae, and to determine the effect of SSF on phytic acid, crude protein, crude fat, and amino acid profile. Response surface methodology (RSM) with Box-Behnken design was used to optimize SSF. The optimal conditions derived from RSM for L. brevis fermentation were: pH=5.1; inoculum size=10%; duration=72 h; substrate to water ratio=1.5. The minimum content of trypsin inhibitors was 6.4 mg g-1 dry matter. The optimal conditions derived from RSM for A. oryzae fermentation were: substrate to water ratio= 0.81; inoculum size=4%; duration=120 h. The minimum content of trypsin inhibitors was 1.6 mg g-1 dry matter. Both L. brevis and A. oryzae decreased trypsin inhibitors dramatically (57.1 and 89.2% respectively). L. brevis fermentation did not affect phytic acid (0.4%) and crude fat (5.2%) considerably, whereas A. oryzae fermentation degraded phytic acid (34.8%) and crude fat (22.0%) contents to a certain extent. Crude protein content was increased after both fermentation (6.4 and 12.9% for L. brevis and A. oryzae respectively). Urease activity was reduced greatly (83.3 and 58.3% for L. brevis and A. oryzae respectively). In conclusion, SSF with A. oryzae and L. brevis reduced trypsin inhibitor content and modified major macronutrients in soybean meal.
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